Not sure about the mute but the others are correct. The white wire is the aerial amplifier so you need to supply it with +12v, I used the remote wire from the double din.
You can pick up switched +12v from fuse A6 in the fusebox using one of these:
2x 12/24V Add Circuit Fuses Tap Piggy Back MINI Blade Fuse Boxes Holder ATM APM | eBay